Sep 4, 2013 Impact of NPRR 520 Impact of NPRR 520 (SCED CCT) (SCED CCT) Market Analysis ERCOT
Dec 30, 2015
Sep 4, 2013
Impact of NPRR 520 Impact of NPRR 520 (SCED CCT)(SCED CCT)
Market AnalysisERCOT
Background of NPRR 520 (SCED CCT)
Why Change?Why Change? SCED over-mitigation issues
What Changed?What Changed? No Monthly and Daily Constraint Competitiveness Test (CCT) SCED CCT runs every 5 minutes (or whenever SCED is
executed) Less set of Resources get mitigated Minimizing unnecessary Base Point oscillations/QSGR dispatch
System Lambda Increase
Mitigation Ratio
Increased Peaker Net Margin (PNM)
Pivotal Players For Each Active Constraint (7/1-7/30) (Continued)
Pivotal Players For Each Active Constraint (7/1-7/30) (Continued)
Top 10 Non-Competitive Constraints
Constraints with Both Competitiveness Status (7/1-7/30)
CONTINGENCONTINGENCY_NAMECY_NAME
CONSTRCONSTR_NAME_NAME
FROM_SFROM_STATIONTATION
TO_STTO_STATIONATION
FROM_SFROM_STA_KVTA_KV
TO_STTO_STA_KVA_KV
CCT_SCCT_STATUSTATUS
CompetitivCompetitive_Freqe_Freq
NonCompetitNonCompetitive_Freqive_Freq
DENTSCS5 1170__A NCDSE HNRSW 138 138COMP 29 6
DGIBSNG5 240__A JEWET SNG 345 345COMP 26 29
DGIBSNG5 260_A_1 JEWET SNG 345 345COMP 77 18
DJEWSNG5 JK_TOKSW_1 TOKSW JK_CK 345 345COMP 325 30
DNAVWTR5 35040__A NAVARRO VENSW 345 345COMP 2 8
DTB_SNG5 SNGZEN99_A SNG ZEN 345 345COMP 6 926
Summary of Impact of NPRR 520
Average number of mitigated resources for each SCED interval:
Old: 100% vs. New: 4.8% Average system lambda increase: $0.2/MWh for 744 hours. Cumulative PNM increase: $80.63/MW. Total number of non-competitive constraints: Old: ~100% vs. New: 95%
Next Step
•Shall we use HDL instead of HSL for CCT calculation?
•Shall we include all online Resources’ LDL as base load?
•Shall we use sf*HSL instead of sf*sf*HSL for ECI calculation?
Thanks!Thanks!